二项式产能方程系数异常情况(B小于零)分析  

Analysis of Abnormal Binomial Coefficient (B<0= for Binomial Deliverability Equation

作　　者：苟宏刚[1] 赵继承[1] 秦志保[1] 常勇峰[1] 

机构地区：[1]中国石油长庆油田分公司气田开发处,西安710021

出　　处：《新疆石油地质》2006年第2期210-212,共3页Xinjiang Petroleum Geology

基　　金：中国石油天然气集团公司重大科技攻关项目;苏里格气田经济有效开发技术(030125-1)资助

摘　　要：从理论上说,二项式方程系数B不可能为负值,但在排除了文献中提及的井底积液影响的原因外,仍然出现异常情况(B小于零),致使现场无法进行产能解释和分析评价。针对这种现象,通过理论分析认为,对于低压低渗气藏,如果忽略了前期工作制度对后期动态的影响,特别在每个工作制度生产后地层压力恢复较低的情况下,就会产生气井产能曲线反转。经理论推导给出了使校正后的曲线既符合产能规律,又能真实反映这类气井实际产能的推荐方程。通过对推荐方程进行实际验算,其可靠性得到检验,故可供类似低压低渗气田借鉴和应用。Theoretically, the binomial coefficient B does not allow being negative value. But the abnormal situation （B〈0） still occurs in practice without consideration of influence of bottom hole liquid loading, causing unable to make in-situ deliverability interpretation and evaluation. The study suggests that for a gas pool with low pressure and low permeability, if ignoring the influence of pre-working system on post-performance, especially under the pressure build-up insufficiency after each working- system operation, productivity curve style of a gas well will be reversed. This theoretical deduction presents recommended equation that not only accords with deliverability regularity, but also represents real productivity of a gas well after correcting curves. The case study with the recommended equation indicates its reliability and applicability to similar gas pools.

关 键 词：气井 产能方程 二项式 系数 异常 

分 类 号：TE312[石油与天然气工程—油气田开发工程] TE332